Steam-boiler for like furnace.



. PATBNTED APR. 4, 1905.

APPLOAYTION FILED JAN. 26 1904. v asuma-sum1.

in). 766,764.'` A GR, HISLOP.

STEAM BOILER'VORI'LIKE PURNAGE.

APPLICATION FILED JAN. 26 1904.

. a SHEETS-SHEET 2.

.PATENTBD APR. 4, 1905;

PATENTED APR. 4, l1905.

I G R HIsLoP STEAM BOILBR 0R LIKE FURNAGB.

APPLICATION FILED JAN. 26,-1904.

UNITED STATES Patented April 4, 1905,

PATENT OFFICE.

STEAM-BOILER 0R LIKE: FURNACE.

SPECIFICATION forming part of Letters Patent No. 786,764, dated April 4, 1905. Appnmion mea January 26,1904. serial No. 190.727.

vsolid fuel than hitherto attained in firing steam-boilers, stills, and the like by the effective commingling of the air required for perfect combustion with the gas or gases produced before being brought into contact with the surface or surfaces to be heated, and

thus remedying the present inherent defect in all systems of heating steam-boilers, stills, muflles, and similar apparatus.

The invention is illustrated by the accompanying drawings, in Which- Figure 1 is a cross-sectional elevation of a single-flue boiler, showing the application thereto of a modification of the improved arrangements for mixing the gas and air prior to combustion.

tical section, and Fig. 3 a horizontal section,

of the same. Figs. 4 to l() show, detached, to a larger scale, the forms of silica tiles employed in making up the screens through which the gaseous mixture passes into the boiler-liuc. Fig. 11 is a longitudinal vertical section of a modified construction of the furnace as applied in connection with a watertube boiler. Fig. 12 is a horizontal section of the same at the line 17 17. Fig. 13 is a front elevation of Fig. 11, and Fi 14 a transverse section at the line 20 20 o Fig. 12.

According to my invention I first gasify the fuel, whether solid orliquid, in a producer or gasifying chamber, and thence I pass it into two parallel combustionchambers or ilues, as at a, Fig. 1, of suitable dimensions and separated by a division-wall of bricks or tiles l), and into said gas I introduce a properly-regulated volume of air, previously heated or otherwise, at the entrance of the said combustion-chambers for the combustion of the gaseous fuel, and to eect a perfect com- Fig. 2 is a longitudinal ver-y mingling of the air and the combustible gas I pass the whole through a screen composed of a series of perforatedr and preferably ribbed silica tiles, bricks, or blocks c, or through' openings in a wall or screen, or between separate arched or other form of silica tiles or other refractory material, which may be of any of the forms shown at Figs. 2, 4, 5, 6, and 7. The said screen is placed at a suitable distance below the boiler-tubes, 'liuc-plates, or outer shell, as the case may be, and so as to effect erfect combustion in said chambers or whe passing through and above the said perforated .tiles or openings and before coming into contact with the heat-absorbing surfaces of the boiler tubes, iiues, or shell-as, for example, in the manner represented at Figs. 1', 2, and 3. By these means I effect the mixing of the as and air within the furnace-chamber of all tubular and other boilers, stills, muflies, or like apparatus fired with similarv furnaces. In the case ofinternal-iiue boilers ofl the Cornish, Lancashire, or marine type I introduce the gaseous fuel at the mouth and lower half of the iiue or flues and its equivalent of air for combustion also at the front of the lower half of the boiler flue or' tube hitherto forming the ash-pit, as indicated at c, Fig. 2, and instead of using the ordinary furnace-bars I introduce the special perforated tiles, screen, or other form of suitable openings, through which the gas and air are passed, as at c in Figs. 1 and 2,

and therebythoroughly mixed, so that perfect combustion is effected within the combustion-chamber and while passing through and above the ports or openings and before the gases come into contact with the heatabstracting flue shell or tubes.` In the primary combustion-chambers or lower half of the boiler-flue I introduce a thin side lining of silica tiles, as indicated at d, Figs. l and 8, to prevent the undue abstraction of heat from the commingling gas and air until perfect combustion has been secured in the cornbustion-flues and while passing through and above the perforations or openings at c and partly to protect that portion of the iiue from undue heating. Under the bed of the combustion chambers or flues I may also Jform one or two air-channels of bricks or clay tubes, `as shown at e, Fig. 1, and in Figs. 9 and 10, through which I pass a supplementary supply of heated air to the furnace-bridge, where it is made to issue through a series of openings or perforations, (indicated at c, Figs. 2 and 3,) the supply of all such gas and air being regulated at front of the boilers by suitable regulating devices. By the means thus described the entire circumference of the flue or iiues of such boilers is utilized as heating-surface, thus adding lar ely to the steam-raising power of such boi ers and at the same time minimizing or preventing the production of smoke.

Figs. l1 to 14 show the application of the system where the gases are introduced into the boiler-chamber or other furnace above the floor-level. The producer or other gas is divided into two or more streams at front, as in the case of flue-boilers, and the equivalent of air Jfor combustion, previously heated or otherwise, is introduced into the gas and the gas and air enter the comlmstion-chambers es, or I may introduce the air into the side 'llues c, and from these iiues the air passes through the ports a2 with the chambers 08, or I may introduce the air partly through the flues c4 and the rest come 1n with the gas. At the same time I form air-channels c2 under the bed of the combustionechambers cs, through which I pass a supplementary supply of air from the front to take up the heat conducted through the bed of the combustion-chambers wherein the air is circulated and passes, as indicated by arrows at Fig. 20, through openings c3 in the side walls into the spaces or iiues c4, which may also receive an air-supply from the front, as already described, thence through the openings a? into the combustion-chambers cg.

Figs. 1l to 14 also show means by which I may introduce a supplementary .supply of secondary air, as indicated by arrows at Fig. 20, for combustion, consisting of a channel t, formed of bricks or of tubular clay or silica tiles and forming the central pier wallor walls between the combustion-chambers The supply of said air may be heated or other- Wise and the volume controlled by a suitable device.

Having now described my invention, what I claim, and desire to secure by Letters Patent of the United States, is-q In a steam-boiler furnace, in combination7 a flue into which air and gas are admitted, a partition in said ilue, a lining on. each side el. said 'l'lue for preventing the air and gas giving oii too much heat in the'initial stage of combination, a screen comprising ribbed and arched silica tiles located above said 'lue partly supported by the partition, adapted to eiiect intimate commingling of the air and gas and to lead the air and gas from said [lue through said screen to the top of the combustion-chamber, combustion taking place in said i'lue, between said tiles and at the top of the combuStien-chamber, a hollow bridge at the rear of said combustion-chamber, and air-channels at the foot of said ilue convey ing a supply of heated air to said bridge, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of' two subscribing witnesses.

GEORGE ltOliElt'lSON lllSlAll.

Vitnesses WALLACE FAIRWEATIIER, JN0. ARMSTRONG, Junr. 

